DE2012170A1 - Bowden cable - Google Patents

Description

Dr. A. Msntzel DipUng.W. Dahlk · March 13, 1970

Palen, lawyers W./Li,

Refrafi »at ΚοΊη

Celestial 137

Teleflex Incorporated,
North Wales, Pennsylvania (V, St * A _t )

Bowden cable

Hie invention relates to a Bowden cable, which is used to pull and Pressure forces with the help of a flexible core through a curved one Way to transmit hinduoh

In particular, the invention relates to a hose with Sheath made from a polymeric plastic that contains the strands and inner sheath surrounds. The strands can be made of metal wires, for example be educated. Bowden cables using such hoses are very flexible and have the ability to save insofar as

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the sole endeavors to return to a straight or original shape and the wire strands «la tension absorbing Elements act to prevent the hose from being stretched or to allow it only in a controlled manner.

In the manufacture of such a hose, the strands lie or wires with a large pitch helically around the inner sheath, and the polymeric plastic jacket is around the wires and sprayed the inner shell around. Such spraying takes place continuously, with the endless hose subsequently is cut to length. It often happens, however, that after the sons of the sole piece, the outer coat is removed from the ends of the wires laid with a large pitch shrinks away. Such shrinkage leads to difficulties in manufacture of Bowden cables. When the hose pieces are cut, they are, for example, often on hats outer jacket of the hose hats or the like, which sit at the ends and around which a fitting made of a polymeric plastic can be molded in order to be able to be brought into a mechanical mold sole with the hose. If the If the outer jacket shrinks back, a smaller length of the jacket is in the pitting, and consequently a number of the grooves in the jacket are not unified by the pitting to accommodate the force

greatly reduce the amount of pitting required from the hose. In addition, the Rücksohrumpfen The wires laid with great pitch are exposed, and these protruding wires can cause damage of the shapes in which the ends of the hose sit To be molded lengthways around them.

In an effort to overcome the problem of rear socking, Bowden cables have been produced in which the wires laid at a steep incline are selected to be continuous over their IMxige. Bas has, however, led to serious disadvantages, for example a decisive undesirable reduction in the flexibility of the hose and a very considerable increase in the weight of the Bowden cable compared to a corresponding arrangement in which such continuous waves are not provided. '

Accordingly, the invention aims to provide a Bowden cable using a tube with an inner liner to cover the strands with large slope are wound around helically, with a coat wrapped around the strands and with the strands spaced apart Have irregularities in order to eliminate the difficulties arising as a result of the shrinkback ens, nevertheless but to ensure a Bowden cable that has the required flexibility

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billtätselgensobaften has, without there being a significant increase in weight

The invention is explained in more detail below using an exemplary embodiment with reference to the drawing. In of the drawing are:

Fig. 1 is a view of the Bowden cable; 2 shows a detail in section through the Bowden cable;

Flg. 3 shows a detail la section similar to the illustration in FIGS. 2 and

Flg. 4 is a section in the transverse direction essentially on line 4-4 of FIG. 3.

The Bowden cable 10 comprises a guide to which the hose 12, dl · Fittings 14 and a flexible core 16 belong. The flexible one Soul can be gatekeeper in the most solitary fora, according to However, the division is a metal wire that on the fiiden with loops is to be attached to it To enable control parts and thus to be able to transmit a movement between these parts. The flexible hose 12 um-

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holds an inner sheath 20, which preferably consists of a polymeric plastic, furthermore three strands are provided which are formed by round metal wires 22. Pie metal wires 22 are laid helically around the inner sheath 20 with a steep pitch. The angle of inclination is preferably approximately 75 °. Of the Hose also includes a jacket 24 made of a polymeric Plastic that is wrapped around the inner shell 20 and around the wires 22 wound with a steep pitch. The inner shell 20 can be formed in any way from a suitable material in order to ensure its flexibility and a friction arm Form storage so that the soul 16 can be moved freely in it can be. Thus, while the inner shell 20 can have various shapes, it is preferably an extruded one made of polymer plastic, the self-lubricating Has properties. Well-suited materials include Super polyamide resins and polytetrafluoroethylene. In cases where the operational requirements are not so high and lower Costs for the hose are important, less expensive plastics can advantageously be used, for example polyethylene, polypropylene, etc.

The outer flexible jacket 24 can also consist of the aforesaid be made polymeric plastic, preferably also in an extrusion process. In addition, for the

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Jacket 24 a wide variety of other polymeric plastics can be used, for example polyvinyls, in particular plasticized ts polyvinyl chloride.

The fittings 14 are also preferably made from a polymer Made of plastic and molded around the jacket 24. The jacket 24 may have grooves or other deformations, so that the fitting 14 when shaping into a form fit with the Tube 12 arrives. Many of the known polymeric plastics can be used as the material for the fittings 14, for example a super polyamide resin, polytetrafluoroethylene, synthetic elastomers, polyvinyls, polyethylene, or polypropylene the interpolymers thereof.

The sole comprises at least one stragg, for example one Wire 22, and each wire 22 has a number of straight parts 26 which are separated from one another by irregularities 28. As shown, the irregularities 28 consist of a number of waves. It is understood, however, that the irregularities 28 can have a wide variety of other shapes, the only requirement being that they come into a Ponase hluß with the outer jacket 24. Expressed differently, the respective wire 22 has a number of irregularities 28 at intervals along its length, the irregular-

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chains are separated from each other by uniform straight pieces, i.e. undeformed straight pieces

In order for the hose to have the desired flexibility, relative movement between the wires 22 and the inner sheath 20 must be possible. So in the preferred embodiment a lubricant is expediently provided on the outside of the inner shell 20 in order to allow a relative movement between the inner

case 20 and the relatively immobile combination to facilitate; which is formed by the wires 22 laid with a large pitch and the jacket 24. So the lubricant makes one easier Movement of the inner shell 20 relative to the steep slope laid wires 22 and relative to the outer dumbbell 24 »obgleioh the outer jacket 24 does not extend over its entire length moved relative to the wires 22 laid with a large pitch; nevertheless, a certain relative movement between the jacket 24 and the wires 22 laid with a steep incline can take place on the straight parts 26 of the wires 22 laid with a steep incline.

In the preferred execution example are the irregularities 28 spaced apart the respective wires 22, which are approximately 15 cm. It understands that this distance in Can be changed depending on various factors

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can, for example, the area of use and the size of the various elements from which the Bowden cable 10 is formed.

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Claims (1)

201217 (J. - 9 claims 1. Bowden cable with a guide, to which one can be moved in the guide stored movement-transmitting soul belongs, with a flexible hose, which is an inner cover, at least one helically around the inner shell with a steep slope wrapped around strand and a dumbbell around the Strand and is wrapped around the inner sheath, thereby g e k e η η ζ e i ο h η e t that the strand (22) has a lot of ' number of straight sections (26) includes those of irregular opportunities (28) in the strand (22) are separated. 2. Bowden cable according to claim 1, characterized z e i o b η e t that the jacket (24) is made of a polymer Plastic is made, 3. Bowden cable according to claim 2, characterized in that g e k en η > That the Innenhülli (20) made of a polymer Plastic is made,. 4. BQwdenzug according to claim 3, characterized g e te e η η ^ indicates that a lubricant is provided on the outer surface of the inner shell (20). 009884 / U06 5. Bowden cable according to claim 3, characterized by a plurality of strands (22), wherein the strands are each formed by a metal wire. 6. Bowden cable according to claim 5, characterized in that the irregularities (28) by about 15 cm from each other in the longitudinal direction of the respective wire r lying away 7 · Bowden cable according to claim 1, characterized in that the irregularities (28) by a Variety of waves are formed. 8 Bowden cable according to Claim 5, characterized in that the guide has at least one fitting (H) comprised of a polymeric plastic attached to the hose (12) and for attachment to a support structure is provided, wherein the core (16) is a flexible wire. 9. Bowden cable according to claim 5, characterized in that that three wires are provided. 009884/1406